ryan: to help bashar assad. and by the way, if we had the status of forces agreement that the vice president said he would bet his vice presidency on in iraq, we probably would have been able to prevent that, but he failed to achieve that as well. again. >> moderator: what's your criteria for intervention? biden: yeah. ryan: in syria? >> moderator: worldwide. ryan: what is in the national interests of the american people. it's got to be in the strategic national interests of our country. >> moderator: no humanitarian? ryan: each situation will come up with its own set of circumstances, but putting american troops on the ground, that's got to be within the national security interests of the american people. >> moderator: i want to -- we're almost out of time. ryan: things like embargoes and sanctions and overflights, those are things that don't put american troops on the ground. but if you're talking about putting american troops on the ground, only in our national security interest. >> moderator: i want to move